So we know in episode 8 Clara leaves the Doctor and then in episode 9 they probably end up back together again.
If I remember correctly the quote for episode 9 was something like:
"Your home’s not going anywhere and neither is mine until we figure this out"
I imagine this is the Doctor refusing to leave with the TARDIS (his home) until he helps a stubborn Clara save the world (as always). But how wonderful would it be if at the end of the episode they addressed the conversation from 8x01:
“Am I home?”
"If you want it to be."
And this time Clara accepts the TARDIS and Twelve as her rightful home? I think it would also be a great lead into the series finale because it would be them finally admitting to one another just how much they mean to each other (about as big a declaration of love as you can get in this series) and it will make whatever happens in the finale to them that much more painful.